Based on the production analyses, a well needed to be chosen for sitting of the demonstration unit. Major considerations for well selection were to be gas quality, quantity, consistency and well life. A single engine would require up to 25 MCFD of methane. All of the gob wells at the Cambria Mine provide at least this amount of methane. They are generally shut in if they drop below minimum of 25% methane concentration. The total flow generally stays above the 25 MCFD level until this minimum is reached. The search then boiled down to finding a well which would remain on line long enough to provide fuel for the duration of testing. Gob Well 175-B had been on line for nearly a year and had indications of being a fairly constant source of fuel for the demonstration. The site had been selected, it only remained to build the engine generator unit.